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Coil-by-coil image reconstruction with SMASH
C A McKenzie1, M A Ohliger, E N Yeh
1Department of Medicine, Cardiovascular Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA. charles_mckenzie@caregroup.harvard.edu
Magnetic Resonance in Medicine
|September 11, 2001
Summary
This study presents a modified Simultaneous Acquisition of Spatial Harmonics (SMASH) technique. This advancement enables artifact-free magnetic resonance imaging reconstructions by addressing phase cancellation issues in accelerated imaging.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Imaging Physics
- Signal Processing
Background:
- Simultaneous Acquisition of Spatial Harmonics (SMASH) is an MRI technique for faster imaging.
- Existing SMASH methods can produce phase cancellation artifacts due to unaligned coil sensitivities.
- Artifacts in conventional MRI are manageable with methods like sum of squares.
Purpose of the Study:
- To modify the SMASH technique to eliminate phase cancellation artifacts.
- To enable the application of standard coil combination methods to SMASH reconstructions.
- To improve the quality of accelerated MRI scans.
Main Methods:
- A modified SMASH reconstruction approach was developed.
- Component coil sensitivity functions were fitted to tailored spatial harmonics.
- Standard coil combination techniques were applied to reconstructed individual coil images.
Main Results:
- The modified SMASH technique successfully reconstructed accelerated individual component coil images.
- Phase cancellation artifacts were eliminated in the final composite images.
- The method allows for the use of established coil combination strategies.
Conclusions:
- The modified SMASH technique provides artifact-free accelerated MRI.
- This advancement enhances the robustness and applicability of SMASH.
- The improved method facilitates higher quality accelerated imaging acquisition.